Mordant-dyeing red color and process of making same.



UNITED STATES PA ENT FFICE.

[AX H. ISLER, OF MANNHEIM, GERMANY, ASSIGNOR TO THE BADISCHE ANILIN ANDSODA FABRIK, OF LUDWIGSHAFEN, GERMANY.

MORDANT-DYEiNG RED COLOR AND PROCESS OF MAKING SAME.

SPECIFICATION forming part of Le t rs Patent N0=.6 Q,-7 dated 0Appllcatiozi filed February 18, 1899. Serlcl'll'o. 706,014. (Specimena)To all whom it 11mg; concern: I

Be it known that 1, MAX H. ISLER, a citizen of the Swiss Republic,residing at Mannheim, in the Grand Duchy of Baden and Empire of Germany,have'invented new and useful Improvements in the Manufacture of Mordantl Dyeing Coloring Matters, (for which patents have been obtained inGermany, No. B. 23,259, dated August 22, 1808; in England, No. 25,651,dated December 5, 1898, and in France, No. 27 0,597 dated November 5,1898,) of which the following is aspecification.

-In Letters Patent, No. 617,686 I have described the production ofmordant-dyeing coloring-matters from dinitro-anthraqninone bodies bytreatment thereof with fuming sulfuric acid in the presence of bothsulfur and horacic acid simultaneously. I have there described thataccording to the conditions observed when elfecting this processeithera' comparatively-insoluble coloring'matter or a;

coloring-matter possessing the character of a sulfoacid and soluble in.cold water is produced.

The present invention consists in the manufacture of a mordant-dyeing'coloring-matter which is comparatively insoluble in water from the saidsulfoacid soluble in cold wa= .ter, described in my said Letters PatentNo.-

In order to produce my new coloring-matterin accordance with the presentinvention,

I treat it with sulfuric acid of a high degree of strength at a hightemperature.

The following example will serve to illustrate the manner in which myinvention can best be carried into practical effect. parts are byweight.

Example: Preparea coloring-matter melt according to example'2 of my saidLetters Pat- The out No. 617,686-that is to say, by mixing to getherabou t ten parts dinitro-anthraquinone, ten parts crystallized boracicacid, two parts of sulfur, and two hundred parts of fuming sulfuricacidcontaining about forty-five per cent. free anhydride, and heatingthis mixture for about twoto two and a half hours 7 at a temperature of140to 150 centigrade.

Allow the inelttocooland'add to it from five to sit tinio 'sfits ,eightof a sulfuric acid containingnbout- -xty three per cent. H

is used as initial material in this invention can be isolated prior totreatment with the strong sulfuric acid; but the process according tothe above example is simpler.

My new coloring-matter thus obtained has I i a percentage compositioncorresponding to that possessed by hexa-oxy-anthraquinones; but itdiffers in its'properties from allthe hexa-oxy-anthraquinones hithertoknown in thatit yields a red-violet solution in concen trated sulfuricacid and dyes cotton material that has been mordanted with alumina,giving" red shades: Itis insoluble in water and inhydrochloric acid andcrystallizes in needles having a cantharides-green luster fromvIntro-benzene. It difiers from itspafnt substance in being insoluble inwaterand-when crystallized from nitro-benzene it contains neithernitrogen nor sulfur.

Now what I claim is- 1. The process for the production of newmordant-dyeing coloring-matter which consists in heating the solubleshlfoacid-like col oring-matter which can be obtained from adinitro-anthraquinone by heating with sulfur, boracic acid and fumingsulfuric acid, with concentrated sulfuric acid until it is convertedinto a comparativelyflnsoluble mordant-dyeing coloring-matter, allsubstantially 'as described.

2. As a new article of manufacture the herein described morda'ntdyeingcol0ring= matter possessing the composition correspondin g to a hexaoxy-anthraquinone, which is soluble in nitro-benzene and crystallizestherefrom. and which dyes alumina+mordanted cotton redshades.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses. v.

'. 7 v M. II. ISLER.

Witnesses: .ERNEST F. EHRHARD'T,

"PAUL Jntws.

